Merge pull request #1274 from abhishek-gola:size_layer_add

* Added models for test_size 0d and 1d

* added model generation script

Author: abhishek-gola

testdata/dnn/onnx/generate_onnx_model_size_layer.py

@@ -0,0 +1,21 @@
+import onnx
+from onnx import helper, TensorProto
+
+def make_size_model(model_path, name, input_shape):
+    # input_shape: e.g. ['N'] for 1D dynamic, or [] for scalar
+    inp = helper.make_tensor_value_info("x", TensorProto.FLOAT, input_shape if input_shape else [])
+    out = helper.make_tensor_value_info("y", TensorProto.INT64, [])
+    node = helper.make_node("Size", ["x"], ["y"])
+    graph = helper.make_graph([node], name, [inp], [out])
+    opset = helper.make_operatorsetid("", 13)
+    model = helper.make_model(graph, opset_imports=[opset], producer_name="size-tests")
+    onnx.checker.check_model(model)
+    onnx.save(model, model_path)
+
+make_size_model("test_size_1d_model.onnx",
+                "test_size_1d", ["N"])
+
+# True scalar input (rank-0, shape []).
+make_size_model("test_size_0d_model.onnx",
+                "test_size_0d", [])
+print("Wrote models.")